I have made a small racing game, i want to have other players race with you but i dont want to have them all running collisions ect and being influenced by each other. In short i want to implament a ghost car system, the 2 players will both race at the same time on the same map together but the only thing that is being passed to each other is the x y and rotation of the other player.

I will be sending out and reciving 3 veribles per frame, can i just store these in a txt file and edit it with php and still maintin any speed at all? Or do i have to go into the technical stuff with those server things?